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Shadow area phase noise correction method based on improved monotonic method

A phase noise and correction method technology, which is applied to measuring devices, instruments, and optical devices, can solve problems such as incomplete workpiece information and under-correction of phase noise, and achieve the effect of ensuring integrity and improving reconstruction accuracy

Active Publication Date: 2019-09-13
湖州菱创科技有限公司
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Problems solved by technology

[0008] In order to solve the current problem of under-correction of phase noise and partial phase information being zeroed due to random noise, resulting in incomplete workpiece information, the present invention provides a shadow area phase noise correction method based on the improved monotonic method

Method used

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  • Shadow area phase noise correction method based on improved monotonic method
  • Shadow area phase noise correction method based on improved monotonic method

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Embodiment 1

[0049] The purpose of the present invention is to correct the phase noise in the shadow area into a monotone continuous non-zero phase, so as to lay the foundation for the subsequent stereo matching of binocular cameras. figure 1 It is the camera field of view analysis diagram, and the main process is divided into the following five parts: phase data acquisition, phase noise correction based on monotonous non-decrease, discrete noise correction based on phase-frequency matrix, continuous noise correction based on phase prediction of adjacent discontinuous points, Phase compensation based on linear method.

[0050] Such as figure 2 As shown, the specific implementation steps are:

[0051] (1) Phase data acquisition

[0052] (1.1) Project 12 four-step phase-shift fringe patterns with frequencies of 1 / 70, 1 / 64 and 1 / 59 (where 70, 64, and 59 are the number of pixels), and the light intensity expression is:

[0053] I1(x,y)=I′(x,y)+I″(x,y)cos[φ(x,y)]

[0054]

[0055] I3(x,...

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Abstract

The invention discloses a shadow area phase noise correction method based on an improved monotonic method, and belongs to the technical field of machine vision. The standard four-step phase shift andmulti-frequency heterodyne are used to solve the absolute phase information of the workpiece surface to ensure that the phase value is unique in the entire measurement space. By using monotonic non-decreasing phase noise correction, the phase frequency matrix is used to calculate the frequency of non-zero phase occurrence in the fixed length interval to the discrete phase noise correction, and twoconsecutive phase noise determination criteria are defined. By comparing the actual and predicted phases between adjacent discontinuity points for correction, the shadow area phase noise can be effectively corrected. By calculating the slope between the discontinuous points and the fitting slope of the non-zero phases on both sides and determining whether the interpolation condition is satisfied,and using the linear method to fill in the partial phase that is zero due to random noise, the integrity of the workpiece information is ensured, and the reconstruction precision is improved. The method can improve the reconstruction precision while ensuring the three-dimensional contour point cloud data of the workpiece at the same time.

Description

technical field [0001] The invention relates to a method for correcting phase noise in a shadow area based on an improved monotone method, and belongs to the technical field of machine vision. Background technique [0002] Structured light technology has the characteristics of non-contact, fast speed, high precision, and low cost, and has been widely used in the acquisition of point cloud data in the field of random box grabbing. [0003] Structured light coding strategies can be divided into three categories: temporal coding, spatial coding and direct coding. Among them, spatial encoding often only needs to project a pattern, which can be used for dynamic scene measurement, but the spatial resolution is relatively low. Direct coding generally only needs to project 1 to 2 projection patterns, and can achieve high spatial resolution, but the color bandwidth of the projector, changes in the color or depth of the measurement surface, camera error and noise sensitivity will res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
CPCG01B11/2504
Inventor 白瑞林陶四杰
Owner 湖州菱创科技有限公司
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